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Jonathan Ellis commented on CASSANDRA-1391: ------------------------------------------- While getting rid of avro is great, replacing "serialize to avro" with "serialize to thrift" isn't as much improvement as I was hoping for. I thought we were on board with modeling the schema "natively" in system columnfamilies as sketched in https://issues.apache.org/jira/browse/CASSANDRA-1391?focusedCommentId=13149875&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13149875. Which would allow the apply/diff design I keep talking about instead of having to do that manually in UCF, allow dropping the last_migration_key indirection, pave the way for CASSANDRA-2477, and probably more simplifications. Is there a reason that doesn't work? > Allow Concurrent Schema Migrations > ---------------------------------- > > Key: CASSANDRA-1391 > URL: https://issues.apache.org/jira/browse/CASSANDRA-1391 > Project: Cassandra > Issue Type: Improvement > Components: Core > Affects Versions: 0.7.0 > Reporter: Stu Hood > Assignee: Pavel Yaskevich > Fix For: 1.1 > > Attachments: > 0001-new-migration-schema-and-avro-methods-cleanup.patch, > 0002-avro-removal.patch, > 0003-oldVersion-removed-new-migration-distribution-schema.patch, > CASSANDRA-1391.patch > > > CASSANDRA-1292 fixed multiple migrations started from the same node to > properly queue themselves, but it is still possible for migrations initiated > on different nodes to conflict and leave the cluster in a bad state. Since > the system_add/drop/rename methods are accessible directly from the client > API, they should be completely safe for concurrent use. > It should be possible to allow for most types of concurrent migrations by > converting the UUID schema ID into a VersionVectorClock (as provided by > CASSANDRA-580). -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira